Rotary carry-type scraper



Aug. 14, 1951 M. A. CLARK ROTARY CARRY-TYPE SCRAPER 2 Sheets-Sheet 1 Filed Aug. 1, 1947 INVENTOR. JVLH. CZarb HTTYS Aug. 14, 1951 M. A. CLARK I 5 5 ROTARY CARRY-TYPE SCRAPER Filed Aug. 1, 1947 2 Sheets-Sheet 2 n-rrrs Q Patented Aug. 14, 1951 UNITED STATES "PATENT OFFICE ROTARY GARRY-TYPE SCRAPER Marion A. Clark, Tulare, Calif.

' Application August 1, 194-37, Serial No; 765,357

4 Claims.

1 The present invention has for one'object the provision of animproved carry-type Scraper for earth working.

Itis another object of the present-invention to provide a carry-type scraper which includes, in

novel assembly, a generally cylindrical bowlhaving its axis extending transverselyandformed adjacent the bottom with a' forwardly opening transverse mouth fitted atits'lower edge with a cuttin and digging blade; and a cireumferen tially compartmented, reversiblypower-actuated rotor in the'bowl operative in one direction of rotation to facilitateand accelerate loading of earth into the bowl from said mouth and blade,

and in the opposite direction of rotation to readily and evenly discharge the loaded earth from the bowl.

A further object of this invention is toprovide ascraper, as above, wherein the rotor includes means thereon-cooperating with the-howl to closesaid-mouth for transport of the'load with the scraper in carrying position.

An additional object of the-invention is to provide a scraper, of the type-described, wherein a load can be obtained'with a reduced draft load, for-the reason that-the powered rotor-in the bowl recurringlysweeps thedug earth from the digging and cuttingblade, thus relieving the resistance to further digging which results from accumulated earth on said blade. As a consequence, larger loads can be obtained with less power, and more rapidly, than otherwise.

It is also an object of the invention to mount the-bowl in fixed relation to the main frame of the scraper, so'that the unitary structure is rigid and strong.

Another object is to support the front end .of

the scraper by a wheel truck coupled to'the scraper main frame by a novel, adjustable mount; such mount permitting of swivel motion --of the truck, while providing means to raise or lower the front end of the scraper main frame *to "correspondingly regulate theworking or carrysuch structure and relative. arrangement .of-parts as'will fully appear. by a perusalof the'following specification and claims.

In the drawings:

Fig. 1 is alongitudinal' sectional'elevation'of lithe scraper, at the start; of .loadingoperations.

by a swivellymounted front truck, indicated gener'ally at 5, which includes-rubber-tired wheels" 6. A draft tongue I projects forwardly'from:the truck 5-for connection with a tractor. Thefront truck 5- is secured'in connection with the forward portion of the mainframe I by a vertically-adjustablemounting unit, indicated generally at 8, which'comprises:

An outer vertical sleeve 9 is fixed, adjacent-its upper end, to the forward end of the main frame I and projects downwardly-therefrom,being initially open' at its lower' end. An'inner vertical sleeve IO slidably engages in telescopic relation within the'outer sleeve 9 from the lower' end of the latter. A head plate Ii closes'the upper end a of theouter sleeve 9, while a bottom plate I2 closes the lower end-of the inner sleeve It. The bottom plate I2 includes a centrally downwardly projecting clevis I3 which straddles, and pivotally connects to, the axle- I4 of the fronttruck 5.

A fluid pressure actuated power cylinder I5 is fixed to the head plate I I within the telescopic sleeve assembly and projects-downwardlytherein to engagement, by means of-a ball and" socket 56, with the b'ottom'pla-te I2. The powercylinderifi is controlled bymeans of a valveregulated, fl'uidpressure conduit system, indicatedin part at IT, whereby the "cylinder 15' can be expanded or retracted to raise? or lower," respectively, the

forward end of the main frame I.

The bowl assembly of the scraper comprises the following structural arrangement:

A cylindrical bowl, indicated generallyat" I 8, is fixedly mounted in the main frame with the axis of said bowl-extending horizontally and transversely; suchbowl including end walls- I9,

a front wall 2llg-and a-rear wall 2|. The bowl is open, at the top, between the front and rear walls, as shown.

Adjacent but ahead of -the low point of the bowl I 8 .the same is formed with a generally forwardly opening,:.transverse. loading-and discharge mouth 22; the bowl including, as extensions of the end walls I9, skirts 23 at the ends of said mouth to prevent lateral escape of dug earth.

At the rear edge of the mouth the bowl is fitted with a transverse, forwardly and downwardly inclined cutting and digging blade 2'4.

The cylindrical bowl I8 is fitted, internally, with a rotor, indicated generally at 25, which includes a cross shaft 26 journaled in connection with the end walls I3 and projecting at opposite ends therebeyond. The cross shaft 26 carries a hub 21, and a plurality of generally radial paddles 28 extend outwardly from said hub in equally spaced relation whereby to form a plurality of circumferentially spaced compartments A, B, C, and D, in the bowl. The paddles 28 extend full length of the bowl axially thereof, and project outwardly sufiicient to run clear of, but closely adjacent, the walls 29 and 2I.

One of the paddles 28 is formed with outwardly divergent paddle sections 29 spaced apart at their outer ends no less than the circumferential Width of the mouth 22. In the starting or initial loading position of the scraper, the divergent paddle sections 29 are at the bottom of the bowl directly to the rear of the cutting and digging blade 24. The paddles are secured to circular end plates 28a.

The rotor is arranged for power actuated, re-

versible rotation in the bowl I8 in the following manner:

A pair of double acting, fluid pressure actuated power cylinders 3E! are fixed on the main frame I ahead of the bowl I8; said cylinders being secured to opposite sides of the frame and extending laterally inwardly; i. e. with the piston rods 3I disposed adjacent each other but for projection in opposite lateral directions. The doubleacting power cylinders 39 are connected in series in a valve regulated fluid pressure conduit system, indicated generally at 32. By means of this conduit system the power cylinders 30 can be simultaneously extended or contracted, which means that the piston rods 30 would act simultaneously, but in opposite directions.

At each end the cross shaft 26 is fitted, exteriorly of the bowl I8, with a pulley 33, anda flexible cable 34 extends, intermediate its ends, over corresponding ones of the pulleys 33. The runs 35 and 36 of each cable extend forwardly and thence turn laterally inwardly about directionchanging sheaves 31 to pass in direction reversing relation about sheaves 38 on different ones of thepiston rods 3I. From the piston rods 3I, the runs extend laterally outwardly to dead-end at any suitable point on the frame or bowl, as shown.

With this arrangement, it will be seen that When the double-acting power cylinders 39 are energized to cause projection of the piston rods 3|, the lineal motion of such rods is converted to rotary motion of the pulleys 33 and the rotor 25. Retraction of the piston rods 3I causes rotation of the rotor in the opposite direction.

When the above described scraper is in use, the rotor 25 is initially in the position shown in Fig. l, and the mounting unit 8 is adjusted to lower the cutting and digging blade 24 into ground engagement, as also shown in such figure. Thereafter, with advance of the implement the blade 24 digs into the earth and the earth, as dug, flows through the mouth 22 into compartment A of the circumferentially compartmented bowl I8.

At the proper time, and after a certain amount of initial advancing movement of the scraper, the power cylinders 3| are actuated so as to turn the 4 rotor 25 in a clockwise direction, whereupon the adjacent paddle 28 sweeps across the mouth 22, carrying into the compartment A substantially all the loose earth which has then been dug by the blade 24.

As the rotor 25 thus turns, the compartment A closes against the rear wall 2I and the compartment B is moved into earth receiving position relative to the mouth 22, and such compartment begins to load.

The above described cycling is continued until all of the compartments A-D, inclusive, are filled with earth, whereupon the divergent paddle sections 29 are brought into register over the mouth 22 to close the latter and prevent spillage of earth from said bowl. The main frame I, together with bowl I8, is then raised to the carrying position of Fig. 3 by proper actuation of adjustment of the mounting unit 8.

When the scraper reaches the point of discharge the power cylinders 30 are actuated in a direction to cause counter-clockwise rotation of the rotor 25, with the result that the compartments aresuccessively brought into register with the mouth 22, and the load in such compartments discharged through said mouth with an even spreading action.

From the foregoing description it will be readily seen that there has been produced such a device as substantially fulfills the objects of the invention, as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimed as new and useful and upon which Letters Patent are desired:

1. A carry-type scraper comprising a wheelsupported main frame, a generally cylindrical bowl mounted on the main frame, said bowl having a transverse, forwardly opening mouth adjacent the bottom thereof, a cutting and digging blade on the bowl at the rear edge of the mouth, a circumferentially compartmented, peripherally open rotor journaled in the bowl in cooperative relation to said mouth and blade, and power means arranged to actuate the rotor; said power means being a fluid pressure actuated power cylinder assembly, and instrumentalities between said power cylinder assembly and rotor. operative to convert lineal motion of the former to rotation of the latter; said instru mentalities including a shaft on the rotor, a pulley on the shaft, and a flexible element extending intermediate its ends about the pulley; the power cylinder assembly being operatively connected to said flexible element to pull on one end portion thereof and pay out the other end portion thereof, reversibly.

2. A carry-type scraper comprising a wheelsupported main frame, a generally cylindrical bowl mounted on the main frame, said bowl having a transverse, forwardly opening mouth adjacent the bottom thereof, a cutting and digging blade on the bowl at the rear edge of the mouth, a circumferentially compartmented, peripherally open rotor journaled in the bowl in cooperative relation to said mouth and blade, and power means arranged to reversibly actuate the rotor; said power means comprising a pair of double acting, fluid pressure actuated power cylinder mounted on the main frame. a shaft on the rotor projecting from opposite ends thereof, a pulley on each end of the shaft, a pair of flexible elements engaging about the pulleys intermediate the ends of said elements, and means to simultaneously actuate said double acting power cylinders, the latter being arranged in cooperation with said flexible elements to cause to and fro motion thereof upon simultaneous operation of the power cylinders in one direction and in the reverse direction.

3. A scraper as in claim 2 in which the power cylinders are mounted transversely on the main frame and include laterally inwardly projecting piston rods, a double sheave on each piston rod, and direction-changing sheaves on the main frame adjacent the sides directing the pair of runs of corresponding flexible elements lengthwise of the power cylinders, the runs of each pair doubling about sheaves on separate piston rods and thence dead-ending on the frame.

4. A carry-type scraper comprising a wheelsupported main frame, a generally cylindrical bowl mounted on the main frame, said bowl having a transverse, forwardly opening mouth adjacent the bottom thereof, a cutting and digging blade on the bowl at the rear edge of the mouth, a horizontal, transverse shaft extending axially through the how], a hub on the shaft, transversely extending, circumferentially spaced paddles radiating from the hub to form a circumferentially compartmented rotor in said bowl, and power means arranged to turn the rotor to successively register the compartments with the mouth; said last named means ineluding pulleys on opposite ends of the shaft, cables leading intermediate their ends about the pulleys, and a double acting power cylinder assembly on the frame, the cables being guided and connected to said cylinders in a manner to convert lineal motion of the cylinders to simultaneous turning motion of the pulleys in the same direction.

MARION A. CLARK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,124,927 Peter July 26, 1938 2,152,700 Le Bleu Apr. 4, 1939 2,169,612 McMillan Aug. 15, 1939 2,182,670 Le Bleu Dec. 5, 1939 2,219,204 Wandscheer Oct. 22, 1940 2,418,813 Anderson Apr. 15, 1947 2,420,319 Lichtenberg et al. May 13, 1947 2,422,813 Walch June 24, 1947 

